<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .a{
            color: green;
        }
        .b{
            color: blue;
        }
        #p1,#p2,#p3,#p4{
        background-color: yellow;
        }
        input{
            color: hotpink;
            background-color: red;
        }
        *{
            border: 1px solid blue;
        }
    </style>
</head>
<body id="body">
<ul>
    <li class="a">张学友</li>
    <li class="b">刘德华</li>
    <li>郭富城</li>
</ul>

<h1 id="p1" class="b">悟空</h1>
<h1 id="p2">八戒</h1>
<h1 id="p3">沙僧</h1>
<h2 id="p4">刘备</h2>

<input type="submit" value="提交按钮">
<input type="button" value="普通按钮">
</body>
</html>